import { describe, it, expect, vi, beforeEach } from 'vitest';
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { registerHealthTool } from '../sage-health.js';
import type { RestClient } from '../../clients/rest-client.js';
import type { SoapClient } from '../../clients/soap-client.js';
import type { SageConfig } from '../../types/index.js';

const mockConfig: SageConfig = {
  url: 'https://x3.example.com:8124',
  user: 'admin',
  password: 'secret123',
  endpoint: 'SEED',
  poolAlias: 'SEED',
  language: 'ENG',
  rejectUnauthorized: true,
};

function createMockRestClient(
  healthResult?: { status: string; latencyMs: number },
  shouldReject = false,
): RestClient {
  return {
    healthCheck: shouldReject
      ? vi.fn().mockRejectedValue(new Error('REST connection refused'))
      : vi.fn().mockResolvedValue(healthResult ?? { status: 'connected', latencyMs: 42 }),
  } as unknown as RestClient;
}

function createMockSoapClient(
  healthResult?: { status: string; latencyMs: number },
  shouldReject = false,
): SoapClient {
  return {
    healthCheck: shouldReject
      ? vi.fn().mockRejectedValue(new Error('SOAP connection refused'))
      : vi.fn().mockResolvedValue(healthResult ?? { status: 'connected', latencyMs: 55 }),
  } as unknown as SoapClient;
}

describe('registerHealthTool', () => {
  let server: McpServer;
  let registerToolSpy: ReturnType<typeof vi.spyOn>;

  beforeEach(() => {
    server = new McpServer({ name: 'test-server', version: '1.0.0' });
    registerToolSpy = vi.spyOn(server, 'registerTool');
  });

  it('registers sage_health tool with correct metadata', () => {
    const restClient = createMockRestClient();
    const soapClient = createMockSoapClient();

    registerHealthTool(server, restClient, soapClient, mockConfig);

    expect(registerToolSpy).toHaveBeenCalledOnce();
    const [name, config] = registerToolSpy.mock.calls[0];
    expect(name).toBe('sage_health');
    expect(config).toMatchObject({
      description: expect.stringContaining('Check connectivity'),
      annotations: {
        readOnlyHint: true,
        destructiveHint: false,
        idempotentHint: true,
        openWorldHint: false,
      },
    });
  });

  describe('handler', () => {
    async function callHealthHandler(
      restClient: RestClient,
      soapClient: SoapClient,
    ): Promise<{ content: Array<{ type: string; text: string }>; isError?: boolean }> {
      registerHealthTool(server, restClient, soapClient, mockConfig);
      const handler = registerToolSpy.mock.calls[0][2] as () => Promise<{
        content: Array<{ type: string; text: string }>;
        isError?: boolean;
      }>;
      return handler();
    }

    it('returns health status with rest and soap sections on success', async () => {
      const restClient = createMockRestClient({ status: 'connected', latencyMs: 42 });
      const soapClient = createMockSoapClient({ status: 'connected', latencyMs: 55 });

      const result = await callHealthHandler(restClient, soapClient);

      expect(result.content).toHaveLength(1);
      expect(result.content[0].type).toBe('text');
      const parsed = JSON.parse(result.content[0].text);
      expect(parsed).toEqual({
        rest: { status: 'connected', latencyMs: 42, endpoint: 'SEED' },
        soap: { status: 'connected', latencyMs: 55, poolAlias: 'SEED' },
      });
    });

    it('handles REST failure gracefully via allSettled', async () => {
      const restClient = createMockRestClient(undefined, true);
      const soapClient = createMockSoapClient({ status: 'connected', latencyMs: 30 });

      const result = await callHealthHandler(restClient, soapClient);

      expect(result.content).toHaveLength(1);
      const parsed = JSON.parse(result.content[0].text);
      expect(parsed.rest).toEqual({ status: 'error', latencyMs: 0, endpoint: 'SEED' });
      expect(parsed.soap).toEqual({ status: 'connected', latencyMs: 30, poolAlias: 'SEED' });
    });

    it('handles SOAP failure gracefully via allSettled', async () => {
      const restClient = createMockRestClient({ status: 'connected', latencyMs: 25 });
      const soapClient = createMockSoapClient(undefined, true);

      const result = await callHealthHandler(restClient, soapClient);

      expect(result.content).toHaveLength(1);
      const parsed = JSON.parse(result.content[0].text);
      expect(parsed.rest).toEqual({ status: 'connected', latencyMs: 25, endpoint: 'SEED' });
      expect(parsed.soap).toEqual({ status: 'error', latencyMs: 0, poolAlias: 'SEED' });
    });

    it('handles both REST and SOAP failures', async () => {
      const restClient = createMockRestClient(undefined, true);
      const soapClient = createMockSoapClient(undefined, true);

      const result = await callHealthHandler(restClient, soapClient);

      expect(result.content).toHaveLength(1);
      const parsed = JSON.parse(result.content[0].text);
      expect(parsed.rest).toEqual({ status: 'error', latencyMs: 0, endpoint: 'SEED' });
      expect(parsed.soap).toEqual({ status: 'error', latencyMs: 0, poolAlias: 'SEED' });
    });

    it('returns error status string from client healthCheck', async () => {
      const restClient = createMockRestClient({ status: 'error: ECONNREFUSED', latencyMs: 5 });
      const soapClient = createMockSoapClient({ status: 'error: WSDL not found', latencyMs: 10 });

      const result = await callHealthHandler(restClient, soapClient);

      const parsed = JSON.parse(result.content[0].text);
      expect(parsed.rest.status).toBe('error: ECONNREFUSED');
      expect(parsed.soap.status).toBe('error: WSDL not found');
    });

    it('includes endpoint and poolAlias from config', async () => {
      const restClient = createMockRestClient();
      const soapClient = createMockSoapClient();

      const result = await callHealthHandler(restClient, soapClient);

      const parsed = JSON.parse(result.content[0].text);
      expect(parsed.rest.endpoint).toBe('SEED');
      expect(parsed.soap.poolAlias).toBe('SEED');
    });

    it('returns valid MCP content format', async () => {
      const restClient = createMockRestClient();
      const soapClient = createMockSoapClient();

      const result = await callHealthHandler(restClient, soapClient);

      expect(result).toHaveProperty('content');
      expect(Array.isArray(result.content)).toBe(true);
      expect(result.content[0]).toHaveProperty('type', 'text');
      expect(result.content[0]).toHaveProperty('text');
      expect(() => JSON.parse(result.content[0].text)).not.toThrow();
    });
  });
});

describe('createServer', () => {
  it('creates server with sage_health tool registered', async () => {
    const { createServer } = await import('../../server.js');
    const server = createServer(mockConfig);

    expect(server).toBeInstanceOf(McpServer);
  });
});